That's the 1502/1503 chart recorder that uses a hot stylus and paper roll with
a punched timing track. Paper is available at $25-$36 a roll (min purchase 10
rolls). I have a mod that lets you use $1-$2 a roll ECG paper.
The 1502B/1503B/1502C/1503C are a different animal. Their chart recorders use
a plain paper roll and a thermal bar printhead. And that horrid print roller
and a paper feed mechanism that really sucks. Once you load a new roll in you
have to print at least 4 charts to get it to feed properly. And if it doesn't
you can spend the rest of eternity getting it properly adjusted.
------------------
Jack Smith at Clifton Laboratories built a replacement for the 1502
chart recorders. An early prototype can be seen here:
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